Calculational Unified Theory for Calculation of Shear Strength of Linear and Planar Members

线性和平面构件抗剪强度计算的计算统一理论

基本信息

批准号：
08455203
负责人：
KAKUTA Yoshio
金额：
$ 2.88万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08455203/
关键词：
Linear members Planar members Shear strength Effective Width Shear reinforcement Dowel action Bond action Nonlinear finite element analysis ディープスラブ押抜きせん断破壊はり型せん断破壊

项目摘要

In this study four topics are discussed. The major results obtained are as follows.1) Effective Width for Shear Failure of RC Deep SlabsThe effective width to the shear capacity of RC deep slabs was discussed from the experimental results. The effect of the length of loading plate on the effective width is larger than that of the supporting plate. If it is considered that the effective width is related to the swell of the compressive concrete strut formed between the loading and supporting plates, the shear span ratio is a factor of great importance to the swell.2) Effect of Shear Reinforcement on Local Shear Failure of RC SlabsFor one way and cantilever RC slabs, the shear reinforcing effects were experimentally investigated. In case of the slabs with a punching shear failure, the shear capacities increase with shear reinforcement. In case of the slabs with a beam shear failure, the capacities increase a little. The strain of the shear reinforcement starts to increase suddenly at a certain load, however, the strains do not reach its yield strain when the slabs reaches its ultimate state.3)Modeling for Dowel and Bond Actions of Longitudinal Bars in Shear Failure of RC MembersModeling for the longitudinal bars in a shear resisting mechanism was conducted. The cracking along a longitudinal bar is caused by a combined effect between the dowel and the bond actions. The deformation of the bars can be described by modeling the surrounding concrete as an elasto-plastic spring. The criteria of the cracking is related to a vertical and a slip displacements of the bars.4)Analytical Study on Axisymmetrical RC SlabsAn effect of the shear reinforcement on the shear capacity of axisymmetrical RC slabs can be described by using a nonlinear finite element analysis. The effect of the tensile and shear reinforcing bars on the member stiffness is clarified by the analysis.

在这项研究中，讨论了四个主题。所获得的主要结果如下。1）从实验结果中讨论了RC深层剪切板的剪切故障的有效宽度，其有效宽度宽度为RC深板的剪切能力。加载板对有效宽度的长度的影响大于支撑板的影响。如果认为有效宽度与载荷和支撑板之间形成的压缩混凝土支柱的膨胀有关，则剪切跨度比对膨胀非常重要。2）剪切加固对局部剪切故障的影响RC平板的一种方式和悬臂RC板，实验研究了剪切增强作用。如果板和冲锋的剪切失效，剪切能力随着剪切钢筋而增加。如果板的板剪切故障，容量会增加一点。剪切钢筋的应变在一定负载下突然开始增加，但是，当平板达到其最终状态时，应变不会达到其屈服压力。3）销售销钉的建模和纵向杆的键作用在RC成员模型的剪切失败中对于抗剪切机制中的纵向条。沿纵向杆的裂纹是由销钉和键作用之间的综合作用引起的。可以通过将周围混凝土建模为弹性塑料弹簧来描述条的变形。裂纹的标准与钢筋的垂直和滑动位移有关。4）剪切钢筋对轴对称RC Slabsan效应对轴对称RC板的剪切能力的分析研究，可以通过使用非线性有限元分析来描述。通过分析阐明了拉伸和剪切钢筋对成员刚度的影响。